import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../components/Login.vue'
import Home from '../components/Home.vue'
import Welcome from '../components/Welcome.vue'
import Users from '../components/user/Users.vue'

Vue.use(VueRouter)

const routes = [
  { 
    path: '/', redirect:'/login'
   }
  ,{ 
    path: '/login', 
    component: Login
   },{
     path:"/home",
     component:Home,
    //  先展示home组件，再重定向到welcome，home组件不应该不会被展示嘛？
    // 为甚这里是 嵌套展示？
     redirect:"/welcome",
     children:[
       {
         path:"/welcome",
         component:Welcome
       },
      //  二级组件也应该写在home组件里面
      {
        path:"/users",
        component:Users
      }
     ]
   }
   
]

const router = new VueRouter({
  routes
})

// 挂载路由导航守卫
router.beforeEach((to,from ,next)=>{
  // next()表示放行，next("/login")表示强制跳转
  if(to.path==='/login') return next();
  // 获取token
  const tokenStr=window.sessionStorage.getItem("token")
  if(!tokenStr) return next('/login')
  next()
})

export default router
